corpse sniper

A person, who in a video game such as call of duty, or halo uses a fallen players' body as a meat sheild, or a hiding place while prone or crouching, as the body camoflagues them and prevents people from seeing him properly.

cody: what the fuck?
john: ha.
cody: goddanm it you were a corpse sniper, weren't you?
john: wouldn't you like to know.

Checkpoint decoy

The act of throw a piece of metal through a metal dector at a airport or any other public place to direct attention away from yourself so you can commit a crime.

beep beep beep
person: where is he?
person#2: whew!
person: damn, he pulled a Checkpoint decoy.